DVB CI 标准在对“高价值”内容的保护和控制方面存在着不足之处。针对原标准的不足，由PHILIPS、NEOTION、SMARDTV等6家公司联合提出了DVB CI PLUS标准.
The DVB CI standard has deficiencies in the protection and control of “high value” content. In response to the shortcomings of the original standards, six companies including PHILIPS, NEOTION, and SMARDTV jointly proposed the DVB CI PLUS standard.
CI标准中缺乏对高价值数据的有效保护容易被盗版。主要在下面几点： 1 CAM已解扰的数据，在没有进行任何防盗版措施情况下，回传到Host。 2 缺乏对高价值数据的拷贝和播放控制。 The lack of effective protection of high-value data in the CI standard is easily pirated. Mainly in the following points: 1 CAM descrambled data, returned to Host without any anti-piracy measures. 2 Lack of copy and playback control of high value data.
Digital TV content protection system block diagram
CI+系统的实现分为： 基本模式和注册服务模式。 CI+系统的工作模式分为：受限工作模式和完全工作模式。 The implementation of CI+ system is divided into: basic mode and registration service mode. The working mode of the CI+ system is divided into a limited working mode and a full working mode.
In order to effectively protect control information and audio and video data, CI+ introduces symmetric key encryption technology to protect important data and information based on the original command interface and data interface. The command interface and data interface for encryption protection in the CI+ standard are simply referred to as SAC and CC.
CI+ uses a device recovery (URL) recovery (URW) list to dynamically manage devices. CI+ specifies the following levels of equipment recycling strategies
Base on Application MMI的MHEG5:
The CI+ Application MMI may operate in a Host that supports other application environments e.g. MHEG-5, MHP, etc. All content to the CI+ presentation engine shall be supplied to the host directly from the CICAM through the Application MMI resource; the CICAM itself may optionally source file data internally from the CICAM and/or directly from the broadcast stream.
CAM Firmware Upgrade Collaboration Agreement
In practice, it is inevitable to upgrade the software of CAM. However, the existing standards work out the corresponding agreement between CAM and Host in the process of CAM software upgrade. Therefore, CI+ has developed a protocol for the CAM software upgrade process to work with Host. The coordination agreement is as follows: 1 The upgrade process is initiated; 2 The upgrade process status is displayed; 3 Upgrade end operation prompt.
specifies the PVR resource which offers the capability of recording CAS protected content and play back at a later date and unattended pin entry. allows the recording of original encrypted content (DVB-CSA) and the ability to play back at a later date by either using the original ECMs or re-encoded ECMs at the CAS discretion.
MHP-based data transmission:
HDCP SRM transmission protocol:
The CICAM may receive System Renewability Messages (i.e. SRM) data files. SRM data files perform the function of blacklist for HDCP . These SRM data files are to be applied to the HDCP function of ahost, subject to the host a.) deploying a HDCP output in b.) HDCP source or repeater mode. CI+ CAM use SAC channel delivery SRM data to Host.